Featured Listing · MLS #4039351

1233 Poplar Avenue: A Mother-Daughter Colonial in Mountainside, NJ

Mountainside, New Jersey 07092

$1,825,000

Price

Bedrooms

3.5

Bathrooms

4,000+

Sq Ft

0.39

Acres

2015

Built

1233 Poplar Avenue, Mountainside NJ - front exterior of custom Colonial

Chef's kitchen with oversized granite island

Walk-out lower level mother-daughter suite recreation room

Is 1233 Poplar Avenue a Mother-Daughter or Multi-Generational Home?

Yes. 1233 Poplar Avenue is a 5-bedroom, 3.5-bathroom custom Colonial in Mountainside, NJ, offering more than 4,000 square feet across three levels, including a newly finished 1,000-square-foot walk-out lower level with its own private entrance, full bathroom, bedroom, and living space — a true mother-daughter or in-law suite layout. Built in 2015 on a 0.39-acre lot and listed at $1,825,000, the home sits near Deerfield Elementary School, offers commuter access to NYC via NJ Transit and I-78/Route 22, and is minutes from Echo Lake Park and downtown Westfield.

Property Description

1233 Poplar Avenue is a custom-built Colonial set on a generous 0.39-acre lot in one of Mountainside, New Jersey's most desirable neighborhoods. Built in 2015 and enhanced with a newly finished, 1,000-square-foot walk-out lower level, this home delivers more than 4,000 square feet of living space, 5 bedrooms, and 3.5 bathrooms across three thoughtfully designed levels — and it was built with exactly the kind of flexibility that multi-generational households and mother-daughter living arrangements require.

A two-story foyer welcomes you into the home, with custom wainscoting and detailed millwork carried throughout the main level. High ceilings, quality craftsmanship, and abundant natural light create a warm, welcoming atmosphere from the moment you walk in. The expansive chef's kitchen anchors the first floor with an oversized granite island, custom cabinetry, and a walk-in pantry, flowing seamlessly into the family room and its gas fireplace. A formal dining room with coffered ceilings and a private living room — currently used as a home office — complete the first floor, offering the separation that remote work and multigenerational living increasingly call for.

Primary Suite & Second Floor

Upstairs, the primary suite includes a generous walk-in closet and a spa-inspired bathroom with a soaking tub and stall shower. Three additional bedrooms offer walk-in closets and ample space, and a second-floor laundry room with custom cabinetry and a utility sink adds everyday convenience — no carrying laundry between floors.

A True Mother-Daughter Layout: The Walk-Out Lower Level

The newly completed walk-out lower level is the feature that sets 1233 Poplar Avenue apart from most homes on the market in Mountainside. Designed with flexibility at its core, it offers a private entrance, 9-foot ceilings, a spacious recreation room, a custom wet bar, a full bathroom, and a guest bedroom with additional living space. Whether you call it a mother-daughter suite, an in-law apartment, au pair quarters, or extended guest accommodations, this level functions as genuinely independent living space — ideal for multi-generational families who want togetherness and privacy at the same time.

Outdoor Living

The professionally landscaped, multi-level backyard makes full use of the property's 0.39-acre lot: a Trex composite deck overlooking the fully fenced, privacy-fenced yard, a paver patio, and an expansive lawn — distinct zones for dining, entertaining, relaxing, and play. An oversized two-car attached garage with custom mudroom storage completes the home.

Features at a Glance

5 bedrooms, 3.5 bathrooms (3 full baths + 1 half bath) across three finished levels
4,000+ total square feet, including a 1,000 sq ft finished walk-out lower level
Two-story foyer with custom wainscoting and millwork
Chef's kitchen: oversized granite island, custom cabinetry, walk-in pantry
Family room with gas fireplace, open to the kitchen
Formal dining room with coffered ceilings; private living room / home office
Primary suite with walk-in closet and spa-inspired bath
Second-floor laundry room with custom cabinetry and utility sink
Mother-daughter / in-law suite: private entrance, 9-ft ceilings, wet bar, full bath, bedroom
Trex composite deck, paver patio, fully fenced 0.39-acre lot
Oversized 2-car attached garage with custom mudroom storage
Built 2015; lower level newly finished
Estimated annual property taxes: approximately $17,923

Location, Schools, Commute & Lifestyle

Schools

1233 Poplar Avenue is zoned for Deerfield Elementary School (grades 3–8), part of the Mountainside School District, roughly 0.3 miles from the home. Deerfield was named a 2024 National Blue Ribbon School of Excellence by the U.S. Department of Education — one of only 11 New Jersey schools to receive that distinction — and the district as a whole ranks among the top 5% of New Jersey districts on published math and reading proficiency data. Younger students attend Beechwood School (PK–2), about 1.1 miles away. High school students attend Governor Livingston High School in neighboring Berkeley Heights.

Sources: U.S. Department of Education National Blue Ribbon Schools Program (2024); publicly reported district proficiency rankings; GSMLS listing data. Provided for informational purposes only.

Commute

Mountainside offers direct NJ Transit bus service to the Port Authority Bus Terminal in Manhattan, with a stop at Route 22 near Borough Hall. Drivers have quick access to Route 22 and Interstate 78, connecting to Newark, Jersey City, and the wider metro area, and to Newark Liberty International Airport, roughly a 20–25 minute drive. Downtown Westfield's NJ Transit rail station, with direct service to New York Penn Station, is also just minutes away — giving commuters a choice between bus and rail depending on their workday.

Lifestyle & Parks

Mountainside is home to two of Union County's premier outdoor destinations: Echo Lake Park, a 139-acre county park with two lakes, ball fields, playgrounds, walking paths, and a summer concert series, and the Watchung Reservation, a 2,000-acre wooded reservation with more than 13 miles of nature trails, horseback riding, and the Trailside Nature and Science Center & Planetarium. The borough also maintains its own local recreation facilities, including a Community Pool and fitness trail. Downtown Westfield — with its shops, restaurants, and NJ Transit station — is a short drive away, along with everyday conveniences like grocery stores, gyms, and healthcare.

Who This Home Is Perfect For

1233 Poplar Avenue is especially well suited for:

Multi-generational families looking for a true mother-daughter or in-law suite with a private entrance
Buyers who want extended family, aging parents, or an au pair to have genuinely independent living space
Growing families who need 5 bedrooms and flexible bonus space (home office, rec room, guest suite)
Commuters who want NYC access without giving up a spacious, suburban lot
Buyers who want a newer-construction Colonial (built 2015) with move-in-ready systems
Anyone entertaining regularly — the kitchen, backyard, and lower-level wet bar are all built for it

Schedule a Private Showing

For more information on 1233 Poplar Avenue — including a walkthrough of the mother-daughter suite — reach out directly.

Call me at 908-379-0737

Frequently Asked Questions

What is the price of 1233 Poplar Avenue in Mountainside, NJ?

1233 Poplar Avenue is listed at $1,825,000. The home is a 5-bedroom, 3.5-bathroom custom Colonial built in 2015, offering more than 4,000 square feet of living space on a 0.39-acre lot. MLS #4039351.

Does 1233 Poplar Avenue have a mother-daughter or in-law suite?

Yes. The newly finished, 1,000-square-foot walk-out lower level has its own private entrance, 9-foot ceilings, a full bathroom, a bedroom, a wet bar, and additional living space — functioning as genuinely independent living space for a mother-daughter arrangement, in-law suite, au pair quarters, or extended guests.

How many bedrooms and bathrooms does 1233 Poplar Avenue have?

The home has 5 bedrooms and 3.5 bathrooms (3 full baths and 1 half bath): 4 bedrooms upstairs, including the primary suite, plus a guest bedroom in the walk-out lower level.

What is the total square footage of 1233 Poplar Avenue?

The home offers more than 4,000 total square feet of living space, including a newly completed 1,000-square-foot finished walk-out lower level in addition to the main and second floors.

What school district is 1233 Poplar Avenue in?

The home is zoned for Deerfield Elementary School (grades 3–8) and Beechwood School (PK–2), both part of the Mountainside School District. High school students attend Governor Livingston High School in Berkeley Heights.

What is the commute like from Mountainside, NJ to New York City?

Mountainside offers direct NJ Transit bus service to the Port Authority Bus Terminal in Manhattan, plus quick access to Route 22 and Interstate 78 for drivers. Downtown Westfield's NJ Transit rail station, with direct service to New York Penn Station, is also just minutes away.

Is 1233 Poplar Avenue good for multi-generational living?

Yes. Between the first-floor home office/living room, the private walk-out lower-level suite, and 5 total bedrooms, the layout was designed for multi-generational households that need both shared living space and private, independent quarters under one roof.

What year was 1233 Poplar Avenue built?

The home was built in 2015. The walk-out lower level, including the mother-daughter suite, recreation room, and wet bar, was newly finished more recently, adding roughly 1,000 additional square feet of living space.

What parks and recreation are near 1233 Poplar Avenue?

Mountainside is home to Echo Lake Park (139 acres, with lakes, ball fields, and playgrounds) and the Watchung Reservation (2,000 acres, with 13+ miles of trails and the Trailside Nature and Science Center). The borough also has its own Community Pool and fitness trail.

What are the annual property taxes on 1233 Poplar Avenue?

Estimated annual property taxes are approximately $17,923, based on current listing data. Buyers should confirm the exact figure with the Mountainside Tax Assessor before closing, as assessments can change.

Calm guidance through every move.

Galina Kaplan · REALTOR® Associate · The Corcoran Group · 908-379-0737

Co-listed with Marina Fridman Rybner, The Corcoran Group · MLS #4039351, GSMLS